(57) A flowmeter (Fl) having a valve member (17), and a plunger (19) movable in response
to fluid flow is characterised in that indicator means responsive to the position
of the plunger (19) to give a reading of the rate of flow of fluid comprises a detector
(39) responsive to the position of the plunger (19) to produce a signal proportional
to the displacement of the plunger, a linearizer (59) having a read-only memory (ROM)
programmed to compensate for non-linearities in the flow responsive displacement characteristics
of the plunger reproduced in the detector output and so produce a linear output, and
a display unit (41) for receiving the output of the linearizer and so provide an accurate
reading of any rate of flow throughout the range of the flowmeter.
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